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Simplifying r + -3(r + -9) + 4 = 5 Reorder the terms: r + -3(-9 + r) + 4 = 5 r + (-9 * -3 + r * -3) + 4 = 5 r + (27 + -3r) + 4 = 5 Reorder the terms: 27 + 4 + r + -3r = 5 Combine like terms: 27 + 4 = 31 31 + r + -3r = 5 Combine like terms: r + -3r = -2r 31 + -2r = 5 Solving 31 + -2r = 5 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-31' to each side of the equation. 31 + -31 + -2r = 5 + -31 Combine like terms: 31 + -31 = 0 0 + -2r = 5 + -31 -2r = 5 + -31 Combine like terms: 5 + -31 = -26 -2r = -26 Divide each side by '-2'. r = 13 Simplifying r = 13
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